期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 4, 期 4, 页码 641-647出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz400045s
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资金
- National Natural Science Foundation of China [21071066, 91027038, 21101079, 21175034]
- MOST [2012BAC01B07, 2012BAD29B05, 2012AA06A303, 20I2BAD29B04, 2011BAK10B07, 2011BAK10B05, 2011BAK10B01, 2010AA06Z302, 2010DFB3047, 2011ZX08012-001, 2012BAK17B10, 2012BAK08B01]
- Natural Science Foundation of Jiangsu Province
- MOF
- MOE [BE2011626, BK2010001, BK2010141, 201210036, 311002]
- ERC [267867]
- Center for Photonic and Multiscale Nanomaterials (C-PHOM)
- National Science Foundation Materials Research Science and Engineering Center program [DMR 1120923]
- AFOSR MURI [AFOSR MURI 444286-P061716]
- FPU from the Spanish ME
- European Research Council (ERC) [267867] Funding Source: European Research Council (ERC)
Organization of nanoparticles (NPs) of different materials into superstructures of higher complexity represents a key challenge in nanotechnology. Polymerase chain reaction (PCR) was used in this study to fabricate chains consisting of plasmonic NPs of different sizes, thus denoted heterochains. The NPs in such chains are connected by DNA oligomers, alternating in a sequence big-small-big-small- ... and spanning lengths in the range of 40-300 nm by varying the number of PCR cycles. They display strong plasmonic chirality at 500-600 nm, the chiral activity revealing nonmonotonous dependence on the length of heterochains. We find the strength of surface-enhanced Raman scattering (SERS) to increase with chain length, while the chiral response initially increased and then decreased with the number of PCR cycles. The relationship between the optical properties of the heterochains and their structure/length is discussed. The length-dependent intense optical response of the plasmonic NP heterochains holds great potential for biosensing applications.
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